Tap, cock, and the like



Nov. 10, 1931. J. HAMILTON ET AL TAP, COCK, AND THE LIKE Filed Jan. 2,1950 Patented Nov. 10, i931 JAMES firmaron ANn .ro1=n\I HYND, or.'rorrANNEsBURG, TRANSVAAL,

. SOUTH AFRICA j l "raie, Coox, AND iran" LIKE ,l

` Vamilicatnml nica 'mmm-y2, 1930, seran No. 413,125, and inthe Union ofsouth Africa maren Y',z', 1929."

This inventionhas reference totaps, cocks, valves and the like, and isapplicable to taps,

et cetera, used for Afluids under appreciable pressure, including water,air, gas, et cetera.

l 5 The objectwith whichtheinvention is designed is lto construct asimple, eiiective and 'inexpensive ltap or the like which, when thenecessary parts are removed in order tolre- `new the washer, or renew orrepair any other part, will cause or allow an fauxiliary or checkvalveautomatically to close the tap, et cetera, and so prevent the escape andwastage of iuid from the supply -pipe to which the tap' or the like isfitted.

' ,According to 'the present` invention the body or main part of thetap, et cetera, which, as usual, forms the housing andpro'vides theseating orfthe ordinary or'main valve, is also'constructed to-provide ahousing and seating for an auxiliary or check valve, which is'soarranged that, in the event of the main valve being removed` from thebody, the auxiliary or check valve automatically closes the tap, etcetera, under `the influence of the prescontrol of the main valve. Theauxiliary valve is arranged on the pressure side of the main valve andis controlled, directly or indirectly, by the means actuating the mainvalve,

and acts to close the tap by co-operating with a seating provided in thebody on the pressure side of themainvalve. The body is constructed toprovide a guideway for the auxiliary valve stem and a passage to admitthe fluid under pressure to the inner end of the guideway beyond theauxiliary valve stem. Means is fitted into the body below the stem foropening a passage for cleaning out and inspection purposes while the tapis under pressure, which means may be in the form of a screw havingflats which allow it to be placed in sith a position as to providepassages for the esca e of dirt. f

T e invention will be more fully explained with the aid of theaccompanying sheet of drawings, wherein two embodiments of the same areshown. In the drawings,

Fig. 1 is a part-sectional elevation of a tapl embodying the inventioninone form, and

Fig. 2 is a part-sectional elevation illussure of the fluid which isnormally under the trating the application of the'invention to a valve.t

Referring more particularly `to- Fig-1 of the-drawings, the invention-isshown incorporated in al tap of the, domestic or similar type.V 1denotes the body of the tap, which 'through the passage 7 into theportion of the ybody which forms the housing Afor-.the aux` iliaryvalve.l SAn` annular seating 8fforthe auxiliary valve9 is formediaroundthepassage/7. f n f The auxiliary or check valve')v includes a `dischaving-a. stein or spindle 10, which projects into a recess 11 ina nutor screwed cap `12 screwed into thebody l.V The recess 11forms'a.guideway for the'spindle l10, and in the bottom of the recess 11,below the inner end of the spindle 10 there Vis arranged a lhelicalspring 13;` 14 is a screw which closes the inner end of the recess 11andv provides `for access totheibottom of the recessll for cleaning out,inspection and 'otherpurposes The screwlll"l maybe provided with a latvor flats 15 to. allow Vof the escape tof dirt from the `bottom "of thelrecess 11 without completely removingthe screw 714;.y 3516', 17, are twoholes formed in the nut or cap 12, which allow the pressure liuid'topass .into the recess -11 below lthe'inne'r end of the stem 10. With"113 placed in compression.` l

fVInthev normal operation the mainval'vey 3,*`

